<template>
  <div>
    <nav-bar>
      <div slot="left" class="back" @click="backClick">
        <img src="~assets/img/common/back.svg" alt="">
      </div>
      <div slot="center" class="title">
        <div v-for="(item, index) in titles" 
              :key="item.id" 
              class="title-item"
              :class="{active: index === currentIndex}"
              @click="titleClick(index)">
          {{item}}
        </div>
      </div>
    </nav-bar>
  </div>
</template>

<script>
import NavBar from 'components/common/navbar/NavBar'

export default {
  components: {
    NavBar
  },
  data() {
    return {
      titles: ['商品', '参数', '评论', '推荐'],
      currentIndex: 0
    }
  },
  methods: {
    titleClick(index) {
      this.currentIndex = index
      this.$emit('titleClick', index)
    },
    backClick() {
      this.$router.back()
    }
  },
}
</script>

<style scoped>
.title {
  display: flex;
  font-size: 14px;
}

.title-item {
  flex: 1;
}

.active {
  color: var(--color-high-text);
}

.back {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
</style>
